In ductile fracture, at what angle to the tensile axis does the crack propagate outwardly to the surface of the material?

In ductile fracture, at what angle to the tensile axis does the crack

1.	In ductile fracture, at what angle to the tensile axis does the crack propagate outwardly to the surface of the material?
A.	90¬¨¬®‚Äö√†√ª
B.	30¬¨¬®‚Äö√†√ª
C.	45¬¨¬®‚Äö√†√ª
D.	15¬¨¬®‚Äö√†√ª
Answer» D. 15¬¨¬®‚Äö√†√ª